(6R,7R)-3-Acetoxymethyl-4-methylene-8-oxo-7-phenylacetylamino-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid methyl ester 、
重氮甲烷 生成 methyl (6'R,7'R)-3'-(acetyloxymethyl)-8'-oxo-7'-[(2-phenylacetyl)amino]spiro[3,4-dihydropyrazole-5,4'-5-thia-1-azabicyclo[4.2.0]oct-2-ene]-2'-carboxylate